HomeworkLib
Question

A sample of 41 running participants required an average time of 105 minutes to complete the...

A sample of 41 running participants required an average time of 105 minutes to complete the race with a standard deviation of 20 minutes.
(1) What is the lower and upper limits of a 90% confidence interval for the population mean

math   Statistics-And-Probability   
0 0
Add a comment Improve this question Transcribed image text
Next > < Previous
Sort answers by oldest

Homework Answers

Answer #1

0 0
Add a comment
Know the answer?
Add Answer to:
A sample of 41 running participants required an average time of 105 minutes to complete the...
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for? Ask your own homework help question. Our experts will answer your question WITHIN MINUTES for Free.
Similar Homework Help Questions

  • The average time taken by a sample of 68 runners to complete a 10km race was...

    The average time taken by a sample of 68 runners to complete a 10km race was 42 minutes. Assuming a population standard deviation of 8.65 minutes, construct a 99% confidence interval for the true average time taken by all runners to complete the race. Interpret your answer. (6) Confidence Level Z - Limits 90% ± 1.645 95% ±1.96 99% ±2.58

  • A random sample of 30 business students required an average of 43.4 minutes to complete a...

    A random sample of 30 business students required an average of 43.4 minutes to complete a statistics exam. Assume that the population standard deviation to complete the exam was 8.7 minutes. What is the margin of error for a​ 98% confidence interval around this sample​ mean?

  • In a random sample of 8 people, the mean commute time to work was 33.5 minutes...

    In a random sample of 8 people, the mean commute time to work was 33.5 minutes and the standard deviation was 7 4 minutes A 90% confidence interval using the t-distribution was calculated to be (28.5,38.5). After researching commute times to work, it was found that the population standard deviation is 9 5 minutes Find the margin of error and construct a 90% confidence interval using the standard normal distribution with the appropriate calculations for a standard deviation that is...

  • Suppose that pizza delivery times are normally distributed with a population standard deviation of 6 minutes....

    Suppose that pizza delivery times are normally distributed with a population standard deviation of 6 minutes. A random sample of 50 pizza delivery restaurants is taken and has a sample mean delivery time of 36 minutes. Construct a 90% confidence interval for the population mean delivery time. What is the sample mean? 6 1.87 36 1.64 What is the sample size? 8.33 90 50 36 What is the population standard deviation? 0.85 50 36 6 What is the confidence level?...

  • A random sample of forty-four 200-meter swims has a mean time of 3.62 minutes and the...

    A random sample of forty-four 200-meter swims has a mean time of 3.62 minutes and the population standard deviation is 0.09 minutes. Construct a 90% confidence interval for the population mean time. Interpret the results. The 90% confidence interval is OD (Round to two decimal places as needed.) Interpret the results. Choose the correct answer below A. B. c. With 90% confidence, it can be said that the population mean time is not between the endpoints of the given confidence...

  • A random sample of 60 business students required an average of 50.7 minutes to complete a...

    A random sample of 60 business students required an average of 50.7 minutes to complete a statistics exam. Assume that the population standard deviation to complete the exam is 10.4 minutes. 1.Calculate the margin of error if the confidence level is 98%.

  • O: le, the mean commute time to work was 33.5 minutes and the standard deviation was...

    O: le, the mean commute time to work was 33.5 minutes and the standard deviation was 7.3 In a random sample of 8 peop minutes A 90% confidence interval using the to work, it was found that the population standard deviation is 9 6 minutes Find the margin of error and construct a 90% confidence interval using the standard normal distribution with the appropriate calculations for a standard deviation that is known. Compare the results t-distribution was calculated to be...

  • in a random sample of 8 people, the mean commute time to work was 36.5 minutes...

    in a random sample of 8 people, the mean commute time to work was 36.5 minutes and the standard deviation was 7.4 minutes. A 90% confidence interval using the t-distribution was calculated to be (31.5,41.5). After researching commute times to work, it was found that the population standard deviation is 9.3 minutes. find the margin of error and construct a 90% confidence interval using normal distribution with the appropriate calculations for a standard deviation that is known. compare the results....

  • a)A sample of 30 patients in a doctor's office showed that they had to wait for...

    a)A sample of 30 patients in a doctor's office showed that they had to wait for an average of 33 minutes before they could see the doctor. The sample standard deviation is 14 minutes. Assume the population of waiting times is normally distributed.At 90% confidence, compute the lower bound of interval estimate for the average waiting time of all the patients who visit this doctor. b)A university planner wants to determine the proportion of spring semester students who will attend...

  • In a random sample of 88 ​people, the mean commute time to work was 35.5 minutes...

    In a random sample of 88 ​people, the mean commute time to work was 35.5 minutes and the standard deviation was 7.2 minutes. A 90% confidence interval using the​ t-distribution was calculated to be left parenthesis 30.7 comma 40.3 right parenthesis(30.7,40.3). After researching commute times to​ work, it was found that the population standard deviation is 8.9 minutes. Find the margin of error and construct a 90% confidence interval using the standard normal distribution with the appropriate calculations for a...

ADVERTISEMENT
Free Homework Help App
Download From Google Play
Scan Your Homework
to Get Instant Free Answers
Need Online Homework Help?
Ask a Question
Get Answers For Free
Most questions answered within 3 hours.
ADVERTISEMENT
ADVERTISEMENT